* multimap, {@link Entry#getValue} returns the value from the multimap, which may change over
   * time, and {@link Entry#setValue} modifies that value. Removing the mapping from the multimap
   * does not alter the value returned by {@code getValue()}, though a subsequent {@code setValue()}
   * call won't update the multimap but will lead to a revised value being returned by {@code
   * getValue()}.
   */
  @Override